package cn.ujn.edu.sun_shine.interceptor;

import cn.ujn.edu.sun_shine.entity.SysUser;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Component
public class Logininterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
// 获取请求的URL
        String url = request.getRequestURI();
        // URL:除了登录请求外，其他的URL都进行拦截控制
        if (url.indexOf("/login") >= 0) {
            return true;
        }
        // 获取Session
        HttpSession session = request.getSession();
        SysUser user = (SysUser) session.getAttribute("USER_SESSION");
        // 判断Session中是否有用户数据，如果有，则返回true,继续向下执行
        if (user != null) {
            return true;
        }
        // 不符合条件的给出提示信息，并转发到登录页面

       request.setAttribute("msg", "您还没有登录，请先登录！");
       request.getRequestDispatcher("/index")
                .forward(request, response);
        //response.sendRedirect("/index");
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
